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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86fc26fab40aa6b8746b289ca62d1f113d5ce4399e64b7e3652b5aac20edc23a' 
  AND token = 'XnH9vg6nQxsn2O3DRzxUu8Bv54mgJgHUTDHWTUi7ZMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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