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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7dc704293b7cc48cfaccd6963324812b19af161439c2a7507ba0adafaf2f3cf' 
  AND token = 'qFAMFf/kyZkh0BmCbChSnRvCPf4i1GA86B+hBp5Dhwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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