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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a5194e420d7bd860c1a2dd29139d9ac4b1b0f7917bca653097f6f741d98e62f' 
  AND token = 'ucWllo9PCXgcOOo63As5C3jgL3UtGEM7oXazKmygxEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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