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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af6479079bb51c7a70ed6bc87f02a1a5dd0995c49b3c6ea8c75af68f71f3f6ff' 
  AND token = 'WB9Qev2yuTUbxje/oNI9pxd3Y1PfuLTG3mOEBK9SRSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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