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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3391dd2fa3738d1d400bef059ecbe9d5675213ff657054b8c639989fc3cab3b' 
  AND token = 'SQ8LZpS9GLGBnJgBxhdrJJSaeSQ47CWkSx2l2KfHx04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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