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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34ad504d84a53607ee049d234ea9e85d702b20555ccfee89ce96bd13e5a7994e' 
  AND token = 'A9aQGHmAQXMZJo3B+cFKy17czrd2yP7/0/OkUNlLemU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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