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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e556582243f260ad3fc44771f5d63bc4dcc9977c9f393676b653c187795a198d' 
  AND token = 'I/XoxUj1WA5QMu3cWrSHTfA3ntRUKsqXt99vhtQnDNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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