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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b771b6d9aa98198053c4b11c4b9cdc44d7d35d8020bc8603603b9350c7955b0b' 
  AND token = 'xTiQo313LTEdeNnvar2zRrgRlbAsDj14c7Xuc28GbYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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