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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41493de2650a8c49e137b98f8d2aae3e514836760d84d95ab4d75d5d43eb94f4' 
  AND token = 'uIUJbIrVf94ms2AmniGvPctx0ePaSK0GCM8GWdcFnUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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