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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '350fe2c8a38e6c2d186a5bdb89a8f9baf058ea838692a1c058106e829cdff93c' 
  AND token = 'npLJIqRp2stFDveBodh813yEr5+DZQXOlsuDQvubqEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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