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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f45c7ebe9674f5d4ddb74f2c129c3a7bc7d22d028d4d4aa154e16370c90849f9' 
  AND token = 'gRyXbXkenBKHKmXhwqTJeOph5UDEJC8P9tCQsaz3saA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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