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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebd17c4078e0b94f2b7399d7174c17021d3092d99997a27b800f8c736da92951' 
  AND token = '0B25WCU7AlyO72sOkTTMAzeBhdW45ycHHaqSMWJY5LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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