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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '370b5f12fcbcffeb2302a201b607627c6b32e3c8be1acb9c38fc75fb57462488' 
  AND token = 'L7YOt/XM82Jumy2ac6vPHQzW6jTaiuaEqpaBHS3HIbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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