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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c8214699a3ee1dffab581df592e71d0434d9c081bc6fecbbd5831316ae74d8e' 
  AND token = 'SujpNnCTbD2gi9kS9xCujxJGz8etWgLzc5mfoEEEo0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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