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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c275a77dcc7fe4fa0a68d898d8a61c568a37ae313b77a9668ac6fb5161c78d64' 
  AND token = 'IHv/OW3yqiFWib7/HOffGn8xSaaTBA96TuHcoDE1evg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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