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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b3b4452c0c0c6f21cc67e82c16059aea2d82cc059b47a5323bcc8ed29b0789c' 
  AND token = 'MX11TQUxKZTNEERWoqnw7Rj9rFujs90ZJoDDiHuCyUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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