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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4230231b05d979553e6be50945567c87e4b98112d6cc477f543cc9d375a7993' 
  AND token = 'n1aIW7saLjYXKQIJQdQXMXHPlq7IFy7xS6A5faz2bd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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