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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a68fc199039e74d6a9076177db611e57cf4bd346229ddcb991fbed16aaf2e4c' 
  AND token = 'pBgH8k0wd01osErgRycFnvHnVER31N9cjoRCV0ZMIVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}