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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69882ffcde642eae5593214deb588a27ce105e3b69047c7bc459213ac43710d5' 
  AND token = '2D886iGzaV3ws1oqLbLBxmKWtiTZ1uwi+RBcOdc5V6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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