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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd679088b0c7a275f6e23dcd9427692a9e410d4da4421ba5a12805d9d593dcfa8' 
  AND token = 'YtDilpwxIEP5TwAHSQ+9XHtjRuzEKvQ6PSnC4RZyY2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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