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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2d7548a20a3cc9ee2c50201638309ac60a54d3951ca4cfe68df1b7ebf873739' 
  AND token = 'b97sL6Tiaoqkmx5urGBdO96qVA1OdhgCqAJH4QIMdX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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