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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1527ab373e02ebe1dbc7d27229aa47c0cf826ef18047fed5fc6fcf72212c769f' 
  AND token = 'BlpoDe5xvR9mNjPe0+wozLiFWeJg5iY2UW2xVnlh+ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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