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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abf6b96646d0e522eaa0fa6ac017b84f74e6dabf0d0aebd0877df6ab3c9a5f9b' 
  AND token = 'm41GAnotbdl4CdKK8ir4JRAmDJZn307Ep5JPp4BNrKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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