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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf7de0aacddf6ecda4a82384713015662b31c0732d4df54c64537e7a646a18ec' 
  AND token = 'UEd6xV9jmx+yPyNlTasIO7FtZAUt6tNgX9ATmS9QRkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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