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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98109d551b2c71e731b6a7517b128d5403e266dff13bc3936f0bfe75a0148ea6' 
  AND token = 'KgHr328mXcTs810bUwdbJ9sdZSnrQ2FMnpCF0w9lXBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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