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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '933d91eba660f99894e012f8e86f5bae1343a52f44c7c3f8db6c63e85f090efa' 
  AND token = '1FQzF09CnmfTtAF9Pxge6nqYodOjpXdgjKeikecQZ6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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