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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '508a7dc849230748099a6f8ca783822f8a7132ff917630c83bcd156ddd1bee3e' 
  AND token = 'heIQaP2xX9JQEUQm5D2AtecM/1cZ40murU6bsA3y3sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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