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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71583b80cbfcb39836bcda8fd0dccb8e2f274ddc4da8e1e05da81ecf20dc8d90' 
  AND token = 'CUHnZgNGjnTv/96IDsK9PunbvGOetw6yQdJ6a6IRqO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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