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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b05ab1a9705d38535ea793603e21ad81eb57b3470f1f7bda78091014fc4cb9d6' 
  AND token = 'GMOUAkvZ/p9cNQsKO+Gs4aJpjvOUkQcD/0/Zjpx19J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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