Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd93b1738cfe2c52aa3bedfe541c4e9dc55a957a979f331d73e69f8b33a08c601' 
  AND token = 'DKx1zYTYcaTfkyFi4Fso94OoFKApseihqJggKBpV8r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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