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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb9c621f560a42bc43294f8567d4565909b67cd95f703e1833d7d08c0020efdc' 
  AND token = 'BCdhqBxSOiJonyhZdd1cde+LB5jeBQZtPDX8cNEfgS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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