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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b74ae654ca07927fcfc198c94f148836031273ae83e93f0178ff201cf8399ca4' 
  AND token = 'P+dt5zOBN4EzaIP2o1jj2QpwuleQP/xKEufJrBYQd6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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