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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '479ee1bebde8ad2d5442c23bc871f3a48a258911f7c20831ce30c984c328ffca' 
  AND token = 'sML+nsA7e5w1BmJkUNEsApc5xmeWeFpSU0SPSv+1XMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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