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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67938f6a86bae318360044b9f3fd839f9a7813102463bb10d6083c68598306bf' 
  AND token = 'kRu+579ziG8xKaYubWKhYknXW1E6S9H4GTt9LEoPZ4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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