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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b24855ca4a06c32f9742c87effa47b3078d03c7f4d9cace37e277d58a2f8167' 
  AND token = 'ns8svQbTk97Hk0mMrZuPT6S/8gHzs5CRPgxTGQRWS6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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