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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '967e94af3af6f144c6fa36fe6f5dca43cf5e451e3d8665d129d77a5694cbe88f' 
  AND token = 'm+x35nB5W/r5BOVb0jQXeWPT2KjIh2Oqb7cQK44TSIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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