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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7f5850f21726000ed6a2fbcf67cd72269e4c5e61eb860eb2c00be69ff57c9a2' 
  AND token = 'm5QltTTNoftnHrqxRnBOombJY1kl6NXIvTjhTJRx7+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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