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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa2a5e965892ea9d99df2c633cd7d885799a3e72f1b1f52fac1a2c47e26dcff4' 
  AND token = 'WtWSn8YXIJOzS0Urc4iZ4IF7jCMsnEcWs3+tNQhWgMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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