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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '194844913a5341ae393c82b2ec788057282267ed4a7e4cd408d7bdd699296c64' 
  AND token = '6KbluXtEPEfD3HHOeLLnecmdrONGu1GiU7nVnSM9F68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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