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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0513e34c84433adfbbcd135604405c4a9d9ba062592cdeb205725c52f86260a0' 
  AND token = 'F3tEbCmM12ZzmL5nNm8K2D/RqvFICUJv95RQFaBJFD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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