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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86ccea55589aac581377fe66a5d10fe6df19fce7ca5697e8d25fb60d249901ff' 
  AND token = 'vxXf0l7qp02YubdiISGF/1a3HSv4DaUy5fTw02rBRGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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