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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93a49ba040a07f58cec8a317d6f47074ecbc18803bf6c812f07becb51ced6640' 
  AND token = 'JsT2vU5zeF8lwjhhHfJH9MJMi8TN4cXecGqs20RdkAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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