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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6587277230e228263d0c303e253634c6539e6482efd3eedaa103641bfe484319' 
  AND token = 'whe31og37mE1HoGHxDAuty+4T5OQkMFkkoIMJ16hXkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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