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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd89618d6e251fea29f1fc077a6885178142a6b76eae00cfc90628315d2fceed4' 
  AND token = 'hzrohqQtOay+Xehy8lHRMIIio512aFDHZZ5jc0YRxyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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