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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '023a14fe52e3c6032763fd807198e61455b0fdf5a89ae669f78804361efc9627' 
  AND token = 'bh3TqC8utAfhyODKSBVSX9ZjBww2dZ5kaPqW4h3s2E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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