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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06cbef2f1b768682e5e3ee3de2a68b66753bfa1f2fbde156bb15f7a9ef1dec84' 
  AND token = 'XWkzCjGKhXi/S90eKk5U12Phzzp/y8gsw1HrB0xeJ98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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