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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b5b6db7bb989cf0ce36a995e056d30a45a331f1b960118a62c13c26eeb5609' 
  AND token = '6LjOgQZUbPaEfYrx29rBgDIuMC/2z5GJa1FaxR0oZxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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