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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f70bb688e36b06fd7219ef3a0dc4e5360ccd4e88deeab868740648c807ced69' 
  AND token = 'PRA0ATFP/be7xU+DuP46hkulEd/dSmEXeKN2f8z224c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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