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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6a2403ea7f49e82dea73316d088ffa72acf85907f14036f9e3a829190ae0d40' 
  AND token = 'Ock5rizi7EVa0KsBacVILA2FGv0QLvV8rJf9TKCZeh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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