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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae7e3bd238e948033f7f21a5a490d0a4de4a842114cc1e89cae1bd3a8337312' 
  AND token = 'doW+U5bnbmR0MJ3s3Ot8DQ1Y/TiVn+NYeOd+WTegFs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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