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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e630b53fe8506811f837294f3e653e03e7341bd8b06ce33b50d99eb08e685ef0' 
  AND token = 'oYh9obk77Pxv7oheTIBm76o3Zu0Jz62WV/JeS+sppE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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