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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3ef0131965d9ea99524b4f58f57a3be44ba71009930194e08b892f96da59643' 
  AND token = 'Xhqfa+4B+2gnvqDzeEq9Q98M8f9AIbqe++FPvUHVYLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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