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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '327db1f7c4ceac3e777df7a80712329185aba9c306811c76a1c74a34d661dfaf' 
  AND token = 'tLyUjwG7SA5lG2hDFG6LERTnPIGxOnb3WUhBbIHl1DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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